Nuclei embedded Software Development Kit, Release 0.2.3

This is release 0.2.3 of Nuclei SDK.

• OS

  • Add RT-Thread 3.1.3 as a new RTOS service of Nuclei SDK, the kernel source
    code is from RT-Thread Nano project.
  • Update UCOSII source code from version V2.91 to V2.93
  • The source code of UCOSII is fetched from https://github.com/SiliconLabs/uC-OS2/
  • Warning: Now for UCOSII application development, the app_cfg.h, os_cfg.h
    and app_hooks.c are required, which can be also found in
    https://github.com/SiliconLabs/uC-OS2/tree/master/Cfg/Template

• Application

  • Add RT-Thread demo application.
  • Don't use the get_cpu_freq function in application code, which currently is only
    for internal usage, and not all SoC implementations are required to provide this function.
  • Use SystemCoreClock to get the CPU frequency instead of using get_cpu_freq() in
    whetstone application.
  • Update UCOSII applications due to UCOSII version upgrade, and application development
    for UCOSII also required little changes, please refer to :ref:design_rtos_ucosii
  • Fix time_in_secs function error in coremark, and cleanup coremark application.

• Documentation

  • Add documentation about RT-Thread and its application development.
  • Update documentation about UCOSII and its application development.
  • Update coremark application documentation.

• Build System

  • Add build system support for RT-Thread support.
  • Build system is updated due to UCOSII version upgrade, the OS/UCOSII/cfg folder
    no longer existed, so no need to include it.

• SoC

  • Update SoC startup and linkscript files to support RT-Thread

• Misc

  • Add SConscript file in Nuclei SDK root, this file is used by RT-Thread package.